SBC PCD1 Series Manual page 156

Saia-Burgess Controls AG
LEDs and connection terminals
9 8
L
Input circuits and terminal designation
Depending on external wiring, this module may be used for source or sink operation.
Source operation (positive logic):
6k6
6k6
9 8
L
Ue : 48 V
24 V
5 V
Sink operation (negative logic):
9 8
L
Ue : 48 V
24 V
Watchdog: This module can be used on all base addresses; there is no interaction with the
watchdog on the CPUs. For details, please refer to the
the correct use of the watchdog in conjunction with PCD2 components.
Manual Manual PCD 1 / PCD 2 Series │ D ocument 26 / 737 EN22 │ 2 013-11-26
7 6 5 4 3 2 1 0
E7 E6 E5 E4 E3 E2 E1 E0
11k
11k
1 0
E1 E0
DC
DC
DC
1 0
E1 E0
DC
DC
5 V
DC
Digital input modules, electrically isolated
Bus connector
Bus interface and
threshold switch
Input circuits
Electrical isolation by
Optocouplers
LEDs
Screw terminals
Inputs E0 to E7
Input load resistors
User ground (-)
+5V
E1
+5V
E0
Switch closed
(positive at input) : Input state "H" = LED on
Switch open : Input state "L" = LED off
Switch closed
(negative at input) : Input state "H" = LED off
Switch open : Input state "L" = LED on
"Watchdog"
Input/output (I/O) modules
section, which describes
5
5-20